/*******************************************************************************
* Copyright 2009, 2010 Innovation Gate GmbH. All Rights Reserved.
*
* This file is part of the OpenWGA server platform.
*
* OpenWGA is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* In addition, a special exception is granted by the copyright holders
* of OpenWGA called "OpenWGA plugin exception". You should have received
* a copy of this exception along with OpenWGA in file COPYING.
* If not, see <http://www.openwga.com/gpl-plugin-exception>.
*
* OpenWGA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenWGA in file COPYING.
* If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
package de.innovationgate.wgpublisher.lucene;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.collections.iterators.ArrayIterator;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import de.innovationgate.utils.SkippingIterator;
import de.innovationgate.utils.WGUtils;
import de.innovationgate.webgate.api.WGAPIException;
import de.innovationgate.webgate.api.WGAbstractResultSetIterator;
import de.innovationgate.webgate.api.WGBackendException;
import de.innovationgate.webgate.api.WGContent;
import de.innovationgate.webgate.api.WGContentKey;
import de.innovationgate.webgate.api.WGContentList;
import de.innovationgate.webgate.api.WGDatabase;
import de.innovationgate.webgate.api.WGException;
import de.innovationgate.webgate.api.WGFactory;
import de.innovationgate.webgate.api.WGResultSet;
import de.innovationgate.wgpublisher.WGACore;
public class LuceneMultiDBResultSet extends LuceneResultSet {
public class LuceneResultIterator extends WGAbstractResultSetIterator<ScoreDoc> {
private int _resultCount = 0;
public LuceneResultIterator() {
super(new ArrayIterator(_hits.scoreDocs));
}
@Override
protected WGContent fetchContentForResult(ScoreDoc result) throws WGAPIException {
try {
return luceneDocToContent(result, _hits.getMaxScore());
}
catch (Exception e) {
throw new WGBackendException("Exception iterating over lucene result", e);
}
}
@Override
protected boolean passesFilter(WGContent content) {
try {
return (!_enhance || content.isVisibleNow());
}
catch (WGAPIException e) {
WGFactory.getLogger().error("Exception determining visibility state of " + content.getDocumentKey(), e);
return false;
}
}
@Override
public boolean hasNext() {
return (_resultLimit == -1 || _resultCount < _resultLimit) && super.hasNext();
}
@Override
public WGContent next() {
if (_resultLimit == -1 || _resultCount < _resultLimit) {
_resultCount++;
return super.next();
}
else {
throw new NoSuchElementException();
}
}
@Override
public int skip(int nrOfElements) {
int limitedElements = 0;
if (_resultLimit != -1) {
int remainingElements = _resultLimit - _resultCount;
if (nrOfElements > remainingElements) {
limitedElements = nrOfElements - remainingElements;
}
}
int notSkippableElements = super.skip(nrOfElements - limitedElements);
return notSkippableElements + limitedElements;
}
}
private int _resultLimit = -1;
public LuceneMultiDBResultSet(TopDocs hits, WGACore core, HttpServletRequest request, Map parameters, Query query, long executionTime) {
super(hits, core, request, parameters, query, executionTime);
}
/* (non-Javadoc)
* @see de.innovationgate.webgate.api.WGResultSet#getContentList(int, int)
*/
public WGContentList getContentList(int start, int length) {
try {
WGContentList contents = new WGContentList();
if (_hits.totalHits > 0) {
for (int i=start-1; i < (start - 1 + length); i++) {
if (i >= _hits.scoreDocs.length) {
break;
}
ScoreDoc doc = _hits.scoreDocs[i];
WGContent content = luceneDocToContent(doc, _hits.getMaxScore());
if (content != null) {
contents.add(content);
}
else {
length++; // Must be increased to compensate not retrievable content
}
}
}
return contents;
}
catch (Exception e) {
_core.getLog().error("Error returning lucene search result", e);
return null;
}
}
/* (non-Javadoc)
* @see de.innovationgate.webgate.api.WGResultSet#getContentList()
*/
public WGContentList getContentList() {
return getContentList(1, results());
}
/* (non-Javadoc)
* @see de.innovationgate.wgpublisher.lucene.LuceneResultSet#close()
*/
public void close() {
_query = null;
_request = null;
}
public SkippingIterator<WGContent> getResultIterator() throws WGAPIException {
return new LuceneResultIterator();
}
public int results() {
if (_resultLimit == -1) {
return _hits.totalHits;
}
else {
return _resultLimit;
}
}
public void limitResults(int limit) {
if (limit < _hits.totalHits) {
_resultLimit = limit;
}
}
}